A Generalized Net Model of the Abdominal Aorta and Its Branches as a Part of the Vascular System Krassimir Atanassov 1(B ) , Valentin Vasilev 2 , Velin Andonov 3 , and Evdokia Sotirova 2 1 Department of Bioinformatics and Mathematical Modelling, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 105, 1113 Soﬁa, Bulgaria krat@bas.bg 2 Faculty of Public Health and Health Care, Prof. Assen Zlatarov University, 1 Prof. Yakimov Street, 8010 Burgas, Bulgaria vailvasilev@mail.bg, esotirova@btu.bg 3 Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 8, 1113 Soﬁa, Bulgaria velin andonov@math.bas.bg Abstract. In a series of papers, Generalized Net (GN) models of the ways of functioning of the diﬀerent systems and organs in the human body are described in general. Each GN model of a particular system or organ can be detailed and made more complex. In this paper a GN model of the abdominal aorta and its branches of the vascular system is proposed. Keywords: Generalized nets · Modelling · Abdominal aorta · Vascular system 1 Introduction The heart together with the blood vessels – arteries, veins and lymph vessels – form the Cardiovascular System (CVS) [10, 13, 26]. The life of every human being begins with the ﬁrst contraction (systole) of the heart and ends with the last. The main function of the CVS is to transport the blood which is the base of the exchange processes of the organism. Despite the fact that blood is a complex colloid and the blood vessels are much more diﬀerent in terms of structure and properties than the ordinary water-pipes, to a vast degree the blood circulation is subject to the laws of hydrodynamics, but with some speciﬁc features. Because of this, the blood circulation in the blood vessels is deﬁned as hemodynamics. The heart resembles a pump with an inﬁnite displacement because the system is closed and inside the system a certain quantity of blood circulates but with diﬀerent quality and functions – arterial or venous. As a result of the exchange c  The Author(s), under exclusive license to Springer Nature Switzerland AG 2021 K. T. Atanassov et al. (Eds.): IWIFSGN 2019, AISC 1308, pp. 175–185, 2021. https://doi.org/10.1007/978-3-030-77716-6_16